If you're willing to go up to 32', you might want to check out the
Stamas 32, which was built over a period of years in two or more
convertible styles. Florrie and I owned one for a couple of years.

This baby had twin 350 Mercruisers (a pity -- I'd have preferred
Crusaders) and an Onan gas genny. I believe some of them were
delivered with diesels; certainly there is a huge amount of room in
the engine room on both the inboard and the outboard side of the gas
engines, and everything is to hand. The genny was under the cockpit
floor, and again there is a vast amount of room there. Dual stations;
interior finished in a nice Formica with chunky teak accents;
reasonable head/shower; V-berth; plenty of room for a sleeper/sofa in
the salon; huge, airy windows in solid aluminum frames. Black
anodized aluminum in various places outside, which of course "peels"
with the years.

Because of the huge size of the below-deck spaces it's easy to see if
there are any problems down there. The only quality issues we found
were rot in the painted wood supports for the water tank under the
cockpit. I'd buy another in a heartbeat if I was in the market for
that kind of boat.

Bear in mind that this is based on a sample of one.

E.J. Bleendreeble
http://www.casualsailor.com